Liquid crystal display device

ABSTRACT

A liquid crystal display panel for displaying images in an active area includes a first substrate having a pair of first short ends and first long ends. A second substrate faces the first substrate so as to hold a liquid crystal layer therebetween. A first polarization plate is arranged on an outside surface of the first substrate. The first polarization plate has a pair of second short ends longer than the first short ends, a pair of second long ends, and a first absorption axis. The angle a 1  made by the first absorption axis with respect to the second short ends is smaller than an angle b 1  made by the first absorption axis with respect to the second long ends. A second polarization plate is arranged on an outside surface of the second substrate and has a second absorption axis.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation of U.S. Ser. No. 14/956,774, filedDec. 2, 2015, which is a continuation of U.S. Ser. No. 14/795,586, filedJul. 9, 2015, now U.S. Pat. No. 9,229,271, which is a divisional of U.S.Ser. No. 14/035,025, filed Sep. 24, 2013, now U.S. Pat. No. 9,110,329,which claims priority from prior Japanese Patent Application No.2012-240302, filed Oct. 31, 2012, the entire contents of each of whichare incorporated herein by reference.

FIELD

Embodiments described herein relate generally to a liquid crystaldisplay device.

BACKGROUND

A liquid crystal display device is used in various fields of OAequipments such as a personal computer and a television set, takingadvantage of the features such as light weight, thin shape, and lowpower consumption. In recent years, the liquid crystal display device isused also as displays for a portable remote terminal such as a cellularphone and PDA (personal digital assistant), a car navigation equipment,and a game machine.

In the liquid crystal display device, a polarization plate isindispensable. Shrinkage of the polarization plate is raised as one ofthe points about which we are anxious in a durability viewpoint. In aliquid crystal display panel with high demand for a narrow frame, sincethe width of a shielded peripheral area surrounding an active areabecomes narrow, a polarization plate end enters to an inner side of theactive area by the shrinkage of the polarization plate. Accordingly,optical leak of the active area occurs in the peripheral area, and thereis a problem of lowering display grace.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in and constitute aportion of the specification, illustrate embodiments of the invention,and together with the general description given above and the detaileddescription of the embodiments given below, serve to explain theprinciples of the invention.

FIG. 1 is a plan view schematically showing a liquid crystal displaypanel PNL applicable to a liquid crystal display device according to oneembodiment.

FIG. 2 is a cross-sectional view schematically showing the display panelPNL shown in FIG. 1.

FIG. 3 is a perspective view schematically showing a first polarizationplate PL1 and a second polarization plate PL2 shown in FIG. 2.

FIG. 4 is a diagram showing relation of outside size between an arraysubstrate AR and the first polarization plate PL1.

FIG. 5 is a diagram showing relation of outside size between a countersubstrate CT and the second polarization plate PL2.

FIG. 6 is a cross-sectional view schematically showing the liquidcrystal display device DSP equipped with the display panel PNL shown inFIG. 1.

DETAILED DESCRIPTION

A liquid crystal display device according to an exemplary embodiment ofthe present invention will now be described with reference to theaccompanying drawings wherein the same or like reference numeralsdesignate the same or corresponding portions throughout the severalviews.

According to one embodiment, a liquid crystal display device includes: aliquid crystal display panel for displaying images in an active area,including; a first substrate having a pair of first short ends and firstlong ends, a second substrate facing the first substrate, and a liquidcrystal layer held between the first substrate and the second substrate,a first polarization plate arranged on an outside surface of the firstsubstrate having a pair of second short ends longer than the first shortends, a pair of second long ends, and a first absorption axis wherein anangle a1 made by the first absorption axis with respect to the secondshort ends is smaller than an angle b1 made by the first absorption axiswith respect to the second long ends; and a second polarization platearranged on an outside surface of the second substrate and having asecond absorption axis.

FIG. 1 is a plan view schematically showing a liquid crystal displaypanel PNL applicable to a liquid crystal display device according to oneembodiment.

The display panel PNL is an active-matrix type liquid crystal displaydevice equipped with an array substrate AR and a counter substrate CTarranged facing the array substrate AR, and a liquid crystal layer LQheld therebetween. The array substrate AR and the counter substrate CTare pasted together by a seal element SE while forming a predeterminedcell gap between the substrates. The cell gap is formed of apillar-shaped spacer which is formed on the array substrate AR or thecounter substrate CT (not illustrated). The liquid crystal layer LQ isheld on an inner side surrounded with the seal element SE in the cellgap between the array substrate AR and the counter substrate CT.

The display panel PNL is equipped with an active area ACT which displaysimages on the inner side surrounded with the seal element SE. The activearea ACT is formed of a plurality of pixels PX in a rectangular shape bybeing arranged in the shape of a (m×n) matrix, for example, (here, m andn are positive integers).

The array substrate AR is equipped with a plurality of gate lines G andsource lines S crossing the gate lines G, a switching element SWconnected with the gate line G and the source line S, and a pixelelectrode PE connected with the switching element SW, etc. Although thecounter substrate CT is equipped with a counter electrode CE which faceseach of the pixel electrodes PE through the liquid crystal layer LQ, forexample, the array substrate AR may be equipped with the counterelectrode CE.

In addition, although explanation is omitted about detailed structuresof the display panel PNL, the display panel PNL is constituted so thatmodes which mainly use vertical electric field or oblique electricfield, such as TN (Twisted Nematic) mode, OCB (Optically CompensatedBend) mode, and VA (Vertical Aligned) mode are applicable. Further,modes which mainly use lateral electric field, such as IPS (In-PlaneSwitching) mode and FFS (Fringe Field Switching) mode may be applicableby arranging the pixel electrode PE and the counter electrode CE on thearray substrate AR.

A signal source for supplying signals required to drive the displaypanels PNL, such as a driving IC chip 2 and a flexible printed circuit(FPC) board 3, is arranged in the peripheral area PRP outside the activearea ACT. More specifically, the array substrate AR is equipped with amounting portion MT which extends to outside beyond a substrate end CTEof the counter substrate CT.

FIG. 2 is a cross-sectional view schematically showing the display panelPNL shown in FIG. 1. Here, the display panel PNL using the VA mode isexplained as an example.

The array substrate AR is formed using a transparent first insulatingsubstrates 10, such as a glass substrate and a resin substrate. Thearray substrate AR is equipped with the switching element SW, the pixelelectrode PE, and a first alignment film AL1, etc., on the firstinsulating substrate 10 facing the counter substrate CT. Although theswitching element SW is not explained in detail, the switching elementSW is constituted by a thin film transistor (TFT), for example. Theswitching element SW is covered with an interlayer insulation film 11.The pixel electrode PE is formed on the interlayer insulation film 11.The pixel electrode PE is formed of a transparent electric conductivematerial, such as Indium Tin Oxide (ITO) and Indium Zinc Oxide (IZO),for example. The pixel electrode PE is covered with the first alignmentfilm AL1. The first alignment film AL1 is formed of material which showsvertical alignment characteristics.

On the other hand, the counter substrate CT is formed using atransparent second insulating substrates 30, such as a glass substrateand a resin substrate. The counter substrate CT is equipped with a colorfilter layer 32, a counter electrode CE, and a second alignment filmAL2, etc., on the second insulating substrate 30 facing the arraysubstrate AR. In addition, although not illustrated, the countersubstrate CT may be further equipped with a black matrix, a transparentovercoat layer, etc. The color filter layer 32 is formed of resinmaterials colored in red, green, blue, etc., respectively. The counterelectrode CE is formed on the color filter layer 32 facing the arraysubstrate AR. The counter electrode CE is formed of transparent electricconductive materials, such as ITO and IZO. In order to form a pluralityof domains in one PX, a control structure for alignment (for example,slit SL) is formed so as to face the pixel electrode PE in the counterelectrode CE. The counter electrode CE is covered with the secondalignment film AL2. The second alignment film AL2 is formed of thematerial which shows vertical alignment characteristics.

The array substrate AR and the counter substrate CT as mentioned aboveare arranged so that the first alignment film AL1 and the secondalignment film AL2 face each other. At this time, a predetermined cellgap is formed between the first alignment film AL1 on the arraysubstrate AR, and the second alignment film AL2 on the counter substrateCT by a spacer which is not illustrated. The liquid crystal layer LQ isinjected in the cell gap as mentioned above.

A first polarization plate PL1 is arranged on an external surface 10B ofthe array substrate AR, i.e., the external surface of the firstinsulating substrate 10. The first polarization plate PL1 is pasted onthe external surface 10B with adhesive 40. The first polarization platePL1 is formed of a laminated layer constituted by a support body 41, alight polarizer 42, and a protection layer 43. A second polarizationplate PL2 is arranged on an external surface 30B in the countersubstrate CT, i.e., the external surface of the second insulatingsubstrate 30. The second polarization plate PL2 is pasted on theexternal surface 30B with adhesive 50. The second polarization plate PL2is formed of a laminated layer constituted by a support body 51, a lightpolarizer 52, and a protection layer 53. Between the first polarizationplate PL1 and the first insulating substrate 10 or between the secondpolarization plate PL2 and the second insulating substrate 30, opticalelements, such as a phase difference film may be provided. Moreover, thesupport bodies 41 and 51 and the protection layers 43 and 53 may beformed of phase difference films.

A back light BL is arranged on a side facing the array substrate AR ofthe display panel PNL. Various types of backlights can be used. Forexample, a light emitting diode (LED) and a cold cathode fluorescentlamp (CCFL), etc., can be applied as a light source of the backlight,and the explanation about its detailed structure is omitted.

FIG. 3 is a perspective view schematically showing the firstpolarization plate PL1 and the second polarization plate PL2 shown inFIG. 2. In addition, only composition required for explanation isillustrated here. Moreover, a direction in parallel to a short end ofthe display panel PNL is made into a first direction X, a direction inparallel to a long end of the display panel PNL is made into a seconddirection Y, and the first direction X and the second direction Y crossat right angle here.

In the first polarization plate PL1 located on a rear side of thedisplay panel PNL, the support body 41 is formed of a phase differencefilm, and has a slow axis D1. The slow axis D1 crosses at an angle θ1with respect to the first direction X. A light polarizer 42 has anabsorption axis A1. The absorption axis A1 crosses at an angle θ2 withrespect to the first direction X. The protection layer 43 does hardlyhave phase difference. That is, in the first polarization plate PL1, thelight polarizer 42 is held between the support body 41 formed of thephase difference film and the protection layer 43.

In the second polarization plate PL2 located on a front side of thedisplay panel PNL, the support body 51 is formed of the phase differencefilm, and has a slow axis D2. The slow axis D2 crosses at the angle θ3with respect to the first direction X. The light polarizer 52 has anabsorption axis A2. The absorption axis A2 crosses at an angle θ4 withrespect to the first direction X. The protection layer 53 does hardlyhave the phase difference. That is, in the second polarization platePL2, the light polarizer 52 is held between the support body 51 formedof the phase difference film and the protection layer 53.

Hereinafter, an example of an axial structure applicable to the VA modeis explained. The angle θ1 is 161°, the angle θ2 is 26°, and the slowaxis D1 and the absorption axis A1 cross at 45° in a X-Y plane eachother. The angle θ3 is 71°, the angle θ4 is 116°, and the slow axis D2and the absorption axis A2 cross at 45° in the X-Y plane, respectively.Moreover, the absorption axis A1 orthogonally cross the absorption axisA2, and the slow axis D1 orthogonally cross the slow axis D2, eachother.

In addition, the rear side and the front side may be replaced each otherin the above-mentioned axial structure.

Next, the structure of the polarization plate applicable to thisembodiment is explained.

FIG. 4 is a diagram showing relation of outside size between the arraysubstrate AR and the first polarization plate PL1.

The array substrate AR has a pair of short ends S11 and S12 in parallelto the first direction X mutually, and a pair of long ends L11 and L12in parallel to the second direction Y mutually, and is formed in a shapeof a rectangle extending in the second direction Y in the X-Y plane. Inaddition, the inner side of a domain shown with a dashed linecorresponds to the active area ACT, and a domain shown with a slashcorresponds to the peripheral area PRP in the array substrate AR. Theperipheral area PRP is a domain which does not contribute to thedisplay, and shielded by a shield layer, etc., which is not illustrated.

The first polarization plate PL1 has a pair of short ends S13 and S14 inparallel to the first direction X mutually, and a pair of long ends L13and L14 in parallel to the second direction Y mutually, and is formed ofin the shape of a rectangle extending in the second direction Y in theX-Y plane. In the first polarization plate PL1, the angle a1 made by theshort ends S13 and S14, i.e., the first direction X, with the absorptionaxis A1 is smaller than the angle b1 made by the long ends L13 and L14,i.e., the second direction Y, with the absorption axis A1. Moreover, inthe first polarization plate PL1, the angle a1 is smaller than the anglec1 made by the short ends S13 and S14, i.e., the first direction X, witha diagonal line DL1. That is, the absorption axis A1 is in parallel tothe direction which intersects the long ends L13 and L14, not thedirection which intersects the short ends S13 and S14.

In the first polarization plate PL1 with above structure, the length lx1of the short ends S13 and S14 in the first direction X is longer thanthe length Lx1 of the array substrate AR along the short ends S11 andS12. In the illustrated example, each of the pair of long ends L13 andL14 of the first polarization plate PL1 protrudes to outside beyond theend of the array substrate AR. That is, the long end L13 is locatedoutside beyond the long end L11 of the array substrate AR, and the longend L14 is located outside the long end L12 of the array substrate AR.In addition, one of the pair of long ends L13 and L14 may be in aposition which overlaps with the long end of the array substrate AR. Forexample, the long end L13 may be located in the position which overlapswith the long end L11 of the array substrate AR, and the long end L14may be located outside the long end L12 of the array substrate AR.

In this embodiment, moreover, the length ly1 of the long ends L13 andL14 of the first polarization plate PL1 in the second direction Y isshorter than the length Ly1 of the long ends L11 and L12 of the arraysubstrate AR in the second direction Y. Each of the pair of short endsS13 and S14 of the first polarization plate PL1 overlaps with theperipheral area PRP, and is located inside the pair of short ends S11and S12 of the array substrate AR. In addition, one of the pair of shortends S13 and S14 may be in the position which overlaps with the shortend of the array substrate AR. Also, the length ly1 may be longer thanthe length of the active area ACT in the second direction Y, and may besubstantially equal to or longer the length Ly1.

FIG. 5 is a diagram showing relation of outside size between the countersubstrate CT and the second polarization plate PL2.

The counter substrate CT has a pair of short ends S21 and S22 inparallel to the first direction X, and a pair of long ends L21 and L22in parallel to the second direction Y, and is formed in the shape of arectangle extending in the second direction Y in the X-Y plane. Inaddition, the inner side of the domain shown with the dashed linecorresponds to the active area ACT in the counter substrate CT, and thedomain shown with the slash corresponds to the peripheral area PRP.

The second polarization plate PL2 includes a pair of short ends S23 andS24 in parallel to the first direction X, and a pair of long ends L23and L24 in parallel to the second direction Y, and is formed in theshape of a rectangle extending in the second direction Y in the X-Yplane. In the second polarization plate PL2, an angle a2 made by theshort ends S23 and S24, i.e., the first direction X, with respect to theabsorption axis A2 is larger than an angle b2 made by the long ends L23and L24. i.e., the second direction Y, with respect to the absorptionaxis A2. Moreover, in second polarization plate PL2, an angle b2 issmaller than an angle c2 made by the long ends L23 and L24, i.e., thesecond direction Y, with a diagonal line DL2. That is, the absorptionaxis A2 is in parallel to the direction which intersects the short endsS23 and S24, not the direction which intersects the long ends L23 andL24.

In the second polarization plate PL2 with above structure, the lengthly2 of the long ends L23 and L24 in the second direction Y is longerthan the length Ly2 of the long ends L21 and L21 of the countersubstrate CT in the second direction Y. In the illustrated example, eachof the pair of short ends S23 and S24 of the second polarization platePL2 protrudes to outside the counter substrate CT. That is, the shortend S23 is located outside the short end S21 of the counter substrateCT, and the short end S24 is located outside the short end S22 of thecounter substrate CT, respectively. In addition, one of the pair ofshort ends S23 and S24 may be in the position which overlaps with theshort end of the counter substrate CT. For example, the short end S23may be located in the position which overlaps with the short end S21 ofthe counter substrate CT, and the short end S24 may be located outsidethe short end S22 of the counter substrate CT.

Moreover, in this embodiment, the length lx2 of the short ends S23 andS24 of the second polarization plate PL2 in the first direction X isshorter than the length Lx2 of the short ends S21 and S22 of the countersubstrate CT in the first direction X. Each of the pair of long ends L23and L24 of the second polarization plate PL2 overlaps with theperipheral area PRP, and is located inside the pair of long ends L21 andL22 of the counter substrate CT. In addition, one of the pair of longends L23 and L24 may be in the position which overlaps with the long endof the counter substrate CT. Also, the length lx2 may be longer than thelength of the active area ACT in the first direction X, and may besubstantially equal to or longer the length Lx2.

In addition, the above first polarization plate PL1 and the secondpolarization plate PL2 may be replaced. At this time, the length of thefirst polarization plate PL1 in the first direction X is formed longerthan the length of the substrate to be attached in the first directionX. Further, it is preferable that the length of the second polarizationplate PL2 in the second direction Y is formed longer than the length ofthe substrate to be attached in the second direction Y.

The light polarizer 42 of the first polarization plate PL1 and the lightpolarizer 52 of the second polarization plate PL2 are formed byextending polyvinyl alcohol (PVA), and the extending direction turnsinto the direction of the absorption axis of the light polarizer. In thefirst polarization plate PL1 and the second polarization plate PL2 usingthe PVA, shrinkage is generated under the influence of heat. Especially,the first polarization plate PL1 and the second polarization plate PL2tend to shrink in the extending direction of the absorption axis. Theshrinkage by the polarization plate is resulted by evaporation ofmoisture contained in the polarization plate under high temperatureenvironment for a long time. Even if the polarization plate is releasedfrom high temperature environment, it is an irreversible change which isnot restored to the original size. Moreover, in recent years, therequest for slimming down the display device is rising. The polarizationplate also tends to become a thin film, and the film thickness of thesupport body and the protection layer which hold the light polarizer isalso becoming thin. For this reason, the mechanical strength whichcontrols shrinkage of the light polarizer by the support body or theprotection layer is falling.

Even if the polarization plate shrinks, neither the long ends nor theshort ends of the polarization plate enters to the position whichoverlaps with the active area ACT by using the larger-sized polarizationplate than the outside dimension of the display panel PNL according tothis embodiment. That is, even if the polarization plates shrink, itbecomes possible to maintain the state where the whole active area ACTis covered with the polarization plate. For this reason, it becomespossible to prevent the generation of the optical leak in thecircumference area of the active area ACT due to exposure of the activearea ACT from the polarization plate. Therefore, it becomes possible tocontrol degradation of display grace.

Like the first polarization plate PL1 shown in FIG. 4, when the angle a1made by the absorption axis A1 with respect to the first direction X issmaller than the angle b1 made by the absorption axis A1 with respect tothe second direction Y, the shrinkage of the first polarization platePL1 becomes remarkable in the first direction X. In the firstpolarization plate PL1, the length lx1 in the first direction X islonger than the length Lx1 of the array substrate AR in the firstdirection X. For this reason, even if the first polarization plate PL1shrinks in the first direction X, the entering of the pair of long endsL13 and L14 to the active area ACT can be suppressed.

Moreover, when one of the long ends L13 and L14 overlaps with the longend of the array substrate AR, the location of the long end may alsomove to the position closing to the active area ACT with the shrinkageof the first polarization plate PL1. However, the width (frame width) ofthe peripheral area PRP between the long end of the array substrate ARand the active area ACT is set more greatly than the shrinkage amount ofthe first polarization plate PL1. Accordingly, the long end of the firstpolarization plate PL1 which overlaps with the long end of the arraysubstrate AR does not enter to the active area ACT with the shrinkage ofthe first polarization plate PL1. In addition, the shrinkage of thefirst polarization plate PL1 in the first direction X is equallygenerated in both of the long ends L13 and L14, the state in which eachof the long ends L13 and L14 protrudes from the array substrate AR tooutside thereof is more preferable.

Like the second polarization plate PL2 shown in FIG. 5, when the anglea2 made by the absorption axis A2 with respect to the first direction Xis larger than the angle b2 made by the absorption axis A2 with respectto the second direction Y, the shrinkage of the second polarizationplate PL2 in the second direction Y becomes remarkable. In the secondpolarization plate PL2, the length ly2 in the second direction Y islonger than the length Ly2 of the counter substrate CT in the seconddirection Y. For this reason, even if the second polarization plate PL2shrinks in the second direction Y, it becomes possible to suppress thepair of short ends S23 and S24 from entering to the active area ACT.

Moreover, when one of the short ends S23 and S24 overlaps with the shortend of the counter substrate CT, the location of the short end may alsomove to the position closing to the active area ACT with the shrinkageof the second polarization plate PL2. However, the width (frame width)of the peripheral area PRP between the short end of the countersubstrate CT and the active area ACT is set more greatly than theshrinkage amount of the second polarization plate PL2. Accordingly, theshort end of the second polarization plate PL2 which overlaps with theshort end of the counter substrate CT does not enter to the active areaACT with the shrinkage of the second polarization plate PL2. Inaddition, the shrinkage of the second polarization plate PL2 in thesecond direction Y is equally generated on the both sides of the shortends S23 and S24, the state in which each of the short ends S23 and S24protrudes from the counter substrate CT to outside thereof is morepreferable.

Next, one practical example of the embodiment is described.

In the display panel PNL, the cell gap holding the liquid crystal layerxLQ is 3 μm, refractive-index anisotropy Δn of the liquid crystal layerLQ is 0.1, and the liquid crystal molecules are vertically aligned. Thesupport body 41 of the first polarization plate PL1 and the support body51 of the second polarization plate PL2 are formed of biaxial phasedifference films, respectively, and the value of Nz coefficient isapproximately 1.6. The axial structures of the first polarization platePL1 and the second polarization plate PL2 are the same as the embodimentexplained with reference to FIG. 3.

In the first polarization plate PL1, the angle a1 made by the absorptionaxis A1 with respect to the first direction X is smaller than the angleb1 made by the absorption axis A1 with respect to the second direction Yas shown in FIG. 4, and the short end size lx1 is larger than theoutside size of the display panel PNL, i.e., the short end size Lx1 ofthe array substrate AR. Like the embodiment shown in FIG. 5, in thesecond polarization plate PL2, the angle a2 made by the absorption axisA2 with the first direction X is larger than the angle b2 made by theabsorption axis A2 with the second direction Y. Further, the long endsize Ly2 is larger than the outside size of the display panel PNL, i.e.,the long end size Ly2 of the counter substrate CT. When the firstpolarization plate PL1 and the second polarization plate PL2 are pastedon the display panel PNL and left under high temperature environment fora long time, shrinkage of the first polarization plate PL1 and thesecond polarization plate PL2 was perceived. However, the optical leakin the active area ACT was not detected. Moreover, it was checked thatneither the polarization plate PL1 nor the polarization plate PL2exfoliated from the display panel PNL

Next, other embodiment is explained.

FIG. 6 is a cross-sectional view schematically showing the liquidcrystal display device DSP equipped with the display panel PNL shown inFIG. 1.

The display device DSP is equipped with a display module MDL fordisplaying images in the active area ACT, a cover element CB arrangedfacing the display module MDL and a transparent resin PSR which pastestogether the display module MDL and the cover component CB. In thisembodiment, the display module MDL is equipped with the display panelPNL and the back light BL.

The display panel PNL holds the liquid crystal layer LQ between thearray substrate AR and the counter substrate CT. The array substrate ARand the counter substrate CT are pasted together by the seal materialSE. Detailed explanation is omitted about the inside structure of thearray substrate AR facing the counter substrate CT. The firstpolarization plate PL1 is pasted on the external surface of the arraysubstrate AR facing the back light BL. The first polarization plate PL1is arranged on the whole active area ACT. Although detailed explanationabout the structure inside the counter substrate CT facing the arraysubstrate AR is omitted, a circumference shield layer SHD is formed inthe circumference of the active area ACT. The circumference shield layerSHD is arranged in the peripheral area PRP of the display panel PNL, andformed in the shape of a rectangular frame. The second polarizationplate PL2 is pasted on the external surface of the counter substrate CTfacing the cover element CB. The second polarization plate PL2 isarranged on the whole active area ACT.

The cover element CB faces the second polarization plate PL2. The coverelement CB is equipped with a transparent base material 60 and a shieldlayer 61. The base material 60 is formed of a transparent glass plate, aplastic plate, etc. The shield layer 61 is arranged in an inside surface60A of the base material 60 facing the display module MDL in theperipheral portion. The inner side surrounded with the shield layer 61serves as a penetration portion TR. The penetration portion TR counterswith the active area ACT.

The resin PSR is arranged between the surface of the display module MDL,i.e., the second polarization plate PL, and the cover element CB so asto paste together. If the variation in the amount of supplied resin PSRand suppression of air bubbles, etc., are considered, it is difficult toform the resin PSR only in the active area ACT by limiting the formationarea, and the formation area necessarily extends to outside of theactive area ACT. For this reason, an edge PSRE of the resin PSR islocated outside the active area ACT, and faces the shield layer 61.

In this embodiment, since the second polarization plate PL2 is pasted tothe cover element CB with the resin PSR, even if the second polarizationplate PL2 is left under high temperature environment, the shrinkage ofthe second polarization plate PL2 can be controlled. For this reason, itis not necessary to make the second polarization plate PL2 larger thanthe outside size of the counter substrate CT. That is, in the case ofthe above embodiment, at least the first polarization plate PL1 pastedon the array substrate AR may be formed more greatly than the outsidesize of the array substrate AR.

As explained above, according to the embodiments, the liquid crystaldisplay device which can control degradation of display grace can besupplied.

While certain embodiments have been described, these embodiments havebeen presented by way of embodiment only, and are not intended to limitthe scope of the inventions. In practice, the structural elements can bemodified without departing from the spirit of the invention. Variousembodiments can be made by properly combining the structural elementsdisclosed in the embodiments. For embodiment, some structural elementsmay be omitted from all the structural elements disclosed in theembodiments. Furthermore, the structural elements in differentembodiments may properly be combined. The accompanying claims and theirequivalents are intended to cover such forms or modifications as wouldfall within the scope and spirit of the inventions.

What is claimed is:
 1. A display device comprising: a first substrateincluding a TFT and a pixel electrode; a polarization plate includingfour straight sides; a cover element; and a protection film includingfour sides, wherein the polarization plate is arranged between the firstsubstrate and the cover element, wherein the first substrate is arrangedbetween the protection film and the polarization plate, wherein the fourstraight sides are arranged inside ends of the cover element, wherein atleast two straight sides of the polarization plate are arranged outsideends of the first substrate, wherein the first substrate has a firstside on which a circuit substrate is provided, a second side oppositethe first side, a third side connecting the first side and the secondside, and a fourth side opposite the third side, wherein the at leasttwo straight sides of the polarization plate correspond to the firstside and the second side of the first substrate and are arranged outsidethe first side and the second side of the first substrate, and whereintwo sides of the protection film correspond to the third side and thefourth side and are arranged outside the third side and the fourth sideof the first substrate.
 2. The display device according to claim 1,wherein the polarization plate includes a phase difference film.
 3. Thedisplay device according to claim 1, further comprising: a secondsubstrate arranged between the first substrate and the polarizationplate, wherein the polarization plate is arranged on the secondsubstrate.
 4. The display device according to claim 1, wherein theprotection film is a part of another polarization plate provided on anopposite side to the cover element side of the first substrate.
 5. Adisplay device comprising: a first substrate including a TFT and a pixelelectrode; a cover element including a light shield layer; apolarization plate arranged between the first substrate and the coverelement; and an adhesive member bonding the cover element and thepolarization plate, wherein an end of the polarization plate is outsidean end of the first substrate, wherein an end of the light shield layeris outside the end of the polarization plate and the end of the firstsubstrate, and wherein a part of an end of the adhesive member is insidethe end of the polarization plate.
 6. The display device according toclaim 5, wherein the polarization plate includes a phase differencefilm.
 7. The display device according to claim 5, further comprising: asecond substrate arranged between the first substrate and thepolarization plate, wherein the polarization plate is arranged on thesecond substrate.